i made a bottle with some thickness
and use mirror and transp to get some refraction from the glass
and it looks very nice
1 - now should the normal on the inside faces be inward or outward ?
2- 1/2 transp inside faces
but at the base of the bottle i need to add some sort of 1/2 transp on the faces inside
cause that’s how the real model is
like the inside is dirty with some grey dark but with a gradient from base and up
so how can i simualte this in blender ?